Pronunciation: (in'si-pit; Lat. ing'ki-pit), [key]
1. the introductory words or opening phrases in the text of a medieval manuscript or an early printed book.
2. Music.the first words of a chanted liturgical text, as that of a Gregorian chant or certain medieval motets.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.